21355753 has 8 divisors (see below), whose sum is σ = 23457600. Its totient is φ = 19351728.

The previous prime is 21355729. The next prime is 21355769. The reversal of 21355753 is 35755312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21355753 - 2⁹ = 21355241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21355783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23998 + ... + 24871.

It is an arithmetic number, because the mean of its divisors is an integer number (2932200).

Almost surely, 2^21355753 is an apocalyptic number.

21355753 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21355753 is a deficient number, since it is larger than the sum of its proper divisors (2101847).

21355753 is a wasteful number, since it uses less digits than its factorization.

21355753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48911.

The product of its digits is 15750, while the sum is 31.

The square root of 21355753 is about 4621.2285163147. The cubic root of 21355753 is about 277.4416315298.

The spelling of 21355753 in words is "twenty-one million, three hundred fifty-five thousand, seven hundred fifty-three".